What's included in this search?

All Collections - Search all of the collections listed below at once.
Technical Reports - Scientific and technical (S&T) reports conveying results of Defense-sponsored research, development, test and evaluation (RDT&E) efforts on a wide range of topics. Collection includes both citations and many full-text, downloadable documents from mid-1900s to present. AULIMP - Air University Library Index to Military Periodicals.
Subject index to significant articles, news items, and editorials from military and aeronautical periodicals, with citations from 1988 to present.
BRD - Biomedical Research Database. Developed from federally funded research, testing and training programs; updated annually.
Congressional Budget Data (CBD) - Congressional Budget Data Provides detailed search and analysis capabilities across the military departments and agencies for Research Development Test and Evaluation (RDT&E) data. DTIC's PDF and Excel spreadsheet versions of Congressional Budget reports are available shortly after postings on Thomas (Library of Congress) website.
DoD Labs and S&T - Allows users to query the DoD laboratory community or other sites identified as related to S&T organizations.
DTIC Online - This search queries the DTIC Online Public Web site.
NDIA - National Defense Industrial Association Conference Proceedings. Collection of presentations from NDIA-sponsored conferences.
RDDS - R-2s furnish narrative information on Research, Development, Test and Evaluation (RDT&E) programs and Program Elements (PE Numbers) within the Department of Defense (DoD).
SCAMPI - Staff College Automated Military Periodical Index. Database of articles on military and naval science, operational warfare, joint planning, national and international politics, and other areas researched by Joint Forces Staff College from 1985 to present.
WHS - Washington Headquarters Service. Department of Defense (DoD) Issuances (current and cancelled), Joint Staff and other U.S. Military (i.e., Army, Navy, Air Force) service publications, Administrative Instructions, Directive-Type Memorandums and DoD Forms.

Abstract : This report describes a technique for obtaining fine-resolution images, suitable for SDI midcourse discrimination, using an inexpensive, lightweight telescope that would ordinarily yield a poor image. If, instead of collecting a blurred image with the telescope, one sends the light through an amplitude interferometer, then the modulus, but not the phase, of the Fourier transform of the object can be measured, despite the aberrations. We have developed and analyzed phase retrieval algorithms that recover the unknown Fourier phase, which allows a fine-resolution image to be reconstructed despite the aberrations of the telescope. It will also correct aberrations due to atmospheric turbulence for a ground-based telescope, and can be used with several other imaging modalities. For the case of interferometry through a partially obscured aperture, an algorithm was developed that combines phase retrieval with interpolation in order to restore the information at the missing spatial frequencies while retrieving the phase at the unobscured spatial frequencies. Another new phase retrieval algorithm, based on the Ayers/ Dainty blind deconvolution algorithm, was also developed. A new methodology for exploring the uniqueness of phase retrieval in a practical sense was developed and tested. It involves finding the ambiguous image which is closest to a given image by a reduced-gradient search technique. The computational requirements for the phase retrieval algorithm were quantified. Laboratory experiments to test the technique were initiated.